Near-Field Radiation from Nano-Particles and Nano-Antennas Illuminated with a Focused Beam of Light

Abstract

The interaction of photons with metallic nanoparticles and nanoantennas yields large enhancement and tight localization of electromagnetic fields in the vicinity of nanoparticles. In the first part of this study, the interaction of a spherical nanoparticle with focused beams of various angular spectra is investigated. This study demonstrates that the focused light can be utilized to manipulate the near-field radiation around nanoparticles. In the second part of this study, the interaction between linearly and radially polarized focused light with prolate spheroidal nanoparticles and nano-antennas is investigated. Strong and tightly localized longitudinal components of a radially polarized focused beam can excite strong plasmon modes on elongated nanoparticles such as prolate spheroids. The effect of a focused beam on parameters such as the numerical aperture of a beam and the wavelength of incident light, as well as particle geometry and composition are also studied.

Synthesis of Copper-Telluride (CuTe) Nanowires and its Characterization using He-Ne Laser

“…Synthesis of several metallic and semiconductors nanowires has been done successfully by electrodeposition method using alumina and polymeric track etched templates [6][7][8][9][10][11][12]. Besides other properties, the optical properties of the nanowires have been studied extensively by various researchers for exploring different optical characterization and analytical techniques [13][14][15][16][17]. The scattering properties of metallic nanowires at certain wavelength range may find its applications in photo-thermal destruction of cancer cells [18], optical antenna [19], chemical and biological sensors [20], cloaking [21], surface-enhanced Roman spectroscopy (SERS) [22], and aperture-less near-field optical microscopy [23].…”